GASTEROPODA. 11 



smallest of them is not distinguishable in any respect from the longer of the two Crag 

 specimens which I have figured under the name of Waelii. Under these circumstances 

 it seems to me that, though F. Waelii is not recognised as a species of the Belgian 

 Miocene (a formation which M. Vanden Broeck now refers to the oldest Pliocene, con- 

 tending that the true Miocene is absent in Belgium), the shell I have figured under this 

 name does occur in the Belgian formations ; and it may perhaps be that, if a large series 

 of specimens of F. Waelii, F. crispus, and F. sexcostatus, were compared with each 

 other, it would be impossible to separate them into distinct species. 



The specimens present all the appearance of genuine fossils of the Coralline Crag, 

 though from their locality (see footnote, p. 3) a question may attach as to this. 



Fusus ? OBSCURUS, 8. Wood. 2nd Sup., Tab. I, fig. 12 a, b. 



Axis, -f-ths of an inch. 



Locality. Cor. Crag,? Boy ton. 



A single specimen, to which I have given the indefinite or undefined generic name of 

 Fusus, was kindly sent to me by Mr. R. Bell. Although the shell is perfect it is decorti- 

 cated throughout, and it is impossible to say whether it was, in its perfect condition, 

 striated or not ; but in its present state I cannot discover any trace of striae upon it. 1 

 give it therefore under the above name from its uncertain characters. 



Fusus? EXACUTUS, 8. Wood. 2nd Sup., Tab. II, fig. 18. 



Locality. Cor. Crag, Sutton. 



Our present figure represents only a fragment of a shell which has been in my 

 Cabinet for many years. It was found by myself at Sutton in the upper portion of the 

 Coralline Crag, and I have kept it hitherto unfigured in the hope of a better specimen 

 turning up. On the left or columella side of the aperture is the impression of what 

 appears to have been that of the fleshy lobe of the animal, but it is not represented in the 

 engraving. The large opening in the outer lip is too low for a sinus, and is, I believe, 

 simply a fracture. I think the specimen belongs to the genus Fusus and not to Pleurotoma. 

 I now figure it because at my advanced age I must relinquish the hope of seeing 

 a more perfect specimen. 



